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issue. First I’ll need some more info so I have a more complete picture of you situation.Do you mean you replaced the valve stems and it still leaks? if so did you replace the valve seats?
If you replaced the valve stems and seats and the valve still leaks then you've done all you can. The valve will need to be replaced.
The valve is the entire device. What you screwed the valve stems into. There are no other parts you can replace that will stop it from leaking. The valve body must have an internal defect.
They're all different. You have to get into the wall to get to it. Once you have the wall open you'll be able to see the entire valve. If this is a tile wall we routinely replace valves by cutting a hole just big enough to work through then there is a cover plate to cover the hole. You'll need to cut the pipes and install a new single handle valve if you want to do this yourself. If you have copper pipes you'll need to know how to solder copper to do this.
Do you have anymore questions?